Congressional candidate Carl DeMaio, who ran against San Diego Mayor Bob Filner in November and lost, announced he will join the recall effort.
The petition drive to collect more than 100,000 valid signatures to put a recall on the ballot kicked off Sunday.
DeMaio announced he's organizing several signature gathering events that he'll publicize through social media and robo-calls.
He also challenged city leaders to set aside their differences and join the recall initiative.
“If you claim to be a leader in San Diego in any regard, you must get behind the recall effort and you must get behind it now,” DeMaio said.
He said city leaders should email the recall petition to their supporters and include opportunities to sign the petition at their regularly scheduled community events.
DeMaio plans to hold similar signature-gathering events at the La Jolla post office on Wednesday and at the Albertson's in Clairemont on Saturday.
Recall organizers need to collect and turn in more than 101,000 valid signatures by Sept. 26 to qualify for the ballot.